Claude Mythos 5 Debuts with Capabara as Open-Source AI Wave Expands

Anthropic unveils Claude Mythos 5, a 10-trillion-parameter model aimed at high-stakes tasks like coding and cybersecurity, paired with Capabara as a mid-tier option, and adopts a phased, safety-focused rollout. Open-source GLM 5.1 enters the scene for instruction-following and multi-step workflows, while Google DeepMind launches Gemini 3.1 for real-time multimodal processing. OpenAI expands Codeex into a plug-in ecosystem to streamline development, and the ARC AGI 3 Benchmark raises the bar for evaluating agentic reasoning. Additional updates include Mistral AI’s Boxrol TTS and Anthropic’s Operon, underscoring a trend toward powerful, open, and safety-conscious AI development.